Direct and Inverse Practice

When dealing with direct and inverse variation, the K represents what?

• Kangaroo

• K-Mart's Blue Light Special

• Constant

• King Cobra Snake

A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. What is the constant of variation?

Hint: Find the constant of variation.

• k = 123

• k = 20

• k = 6.15

• k = 0.16

Y varies inversely to x. If y = 0.5 when x = 4, which equation represents this situation?

Hint: Find the equation.

Given that y varies inversely with x, if x =7 and y = 4, what is y when x = 2?

Hint: Find the equation and use it to find the missing value.

• 14

• 10

• 2

• -14

Y varies inversely with x, and y is 0.5 when x is 4. Which equation represents this situation?

Hint: Find the equation.

• y=2x

• y=2/x

• y=4x

• y=x/2

y varies inversely as x, if y = -3 when x = -6, find y when x = 14. Hint: Find the equation and use it to find the missing value.

• 11

• -11

• 9/7

• 7/9

The cost per person to rent a mountain cabin is inversely proportional (varies inversely) to the number of people who share the rent. If the cost is $36 per person when 5 people share, what is the cost per person when 8 people share?

• $22.50

• $57.60

• $1.11

• $12.50

As the speed of a train increases, the amount of time it takes to arrive at its destination decreases. What type of variation exists between the speed of the train and amount of time?

• Direct Variation

• Inverse Variation

• Neither

• Not enough information

The width of a rectangle varies inversely with its length. If the width is 4 when the length is 18, what is the width when the length is 8?

• 4

• 5

• 9

• 12

The number of kilograms of water in a person’s body varies directly as the person’s mass.  A person with a mass of 90 kg contains 60 kg of water.  How many kilograms of water are in a person whose mass is 75 kg?

• 50 kg water

• 72 kg water

• 94 kg water

• 150 kg water